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5.3
Checking Gas Pressures
5.3.1
Switch off the electricity supply to the zone or system.
5.3.2
Connect a manometer to the test nipple protruding from the rear panel of the Control Box (adjacent to the
Air Inlet Adaptor) see Fig. 19.
5.3.3
Open the Control Box door after releasing the two toggle latch es.
5.3.4
To check the gas supply pressure to each burner :-
5.3.4.1 Unscrew the sealing screw (two turns) of the LEFT (Gas IN) Control Valve test nipple and connect the free
end of the manometer tube (permanently connected to the manometer test nipple inside the rear panel of
the control box) to this test nipple (See Fig. 19). Close the control box door and secure with the two toggle
latches.
5.3.4.2 Ignite the appliance burner by switching on the electricity supply to the appliance and check that the
manometer reading is as stated below for the gas type the appliance is "adjusted for" (see the Data Label
affixed to the Control Box door).
category 2H: gas type G20 (natural): supply pressure
20mbar nom
17mbar min
25mbar max
category 3+: gas type G30 (butane): supply pressure
29mbar nom
25mbar min
35mbar max
category 3+: gas type G31 (propane): supply pressure
37mbar nom
25mbar min
45mbar max
5.3.4.3 Switch off the electricity supply to the appliance open the control box door and remove the manometer tube
from the LEFT (Gas IN) control valve test nipple. Screw in the test nipple sealing screw.
5.3.5
To check the setting pressure at each burner:-
5.3.5.1 Unscrew the sealing screw (two turns) of the RIGHT (Gas OUT) Control Valve test nipple and connect the
free end of the manometer tube (permanently connected to the manometer test nipple inside the rear panel
of the control box) to this test nipple (See Fig. 19). Close the control box door and secure with the two
toggle latches.
5.3.5.2 Ignite the appliance burner by switching on the electricity supply to the appliance and check that the
manometer reading is as stated below for the gas type the appliance is adjusted for (see the Data Label
affixed to the control box door).
Category 2H: gas type G20 (natural): setting pressure
12.5mbar
5.3.5.3 In the event that the burner setting pressure is incorrect, switch off the electricity supply to the appliance
and remove the cap from the integral pressure governor for the Control Valve. Close the control box door
and switch on the electricity supply to the appliance to ignite the burner. Remove the plug from the boss in
the control box door and insert a suitable screwdriver through the exposed hole in the box to locate the
governor adjusting screw. Adjust the pressure by turning the pressure governor adjusting screw clockwise
to increase or anti-clockwise to decrease the burner setting pressure. See Fig. 19.
